Results 



Daily and average air temperature values are tabulated in Table 2 and shown in Figure 3. 



Atmospheric Pressure 



Measurement instruments 



Electronic atmospheric pressure sensor. Atmospheric pressure was measured with a YSI electronic 

 sensor with analog output located in the laboratory building at 9 m above NGVD. Data were record- 

 ed on the FRF computer. Data from this gage were compared with those from an NWS aneroid 

 barometer to ensure proper operation. 



Microbarognq)h. A Weathertronics, Incorporated (Sacramento, CA), recording aneroid sensor 

 (microbarograph) located in the laboratory building also was used to continuously record atmospheric 

 pressure variation. 



The microbarograph was compared daily with the NWS aneroid barometer, and adjustments were 

 made as necessary. Maintenance of the microbarograph consisted of inking the pen, changing the 

 chart paper, and winding the clock every 7 days. During the summer, a meteorologist from the NWS 

 checked and verified the operation of the barometer. 



The microbarograph was read and inspected daily using the following procedure: 



a. The pen was zeroed (where applicable). 



b. The chart time was checked and corrected, if necessary. 



c. The daily reading was marked on the chart for reference. 



d. The starting and ending chart times were recorded, as necessary. 



e. New charts were installed, when needed. 



